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(12) Patent: | (11) CA 2426915 |
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(54) English Title: | LOW-PRESSURE DISCHARGE LAMP WITH A DEVICE FOR SWITCHING IT OFF AT THE END OF ITS SERVICE LIFE |
(54) French Title: | LAMPE A DECHARGE A BASSE PRESSION AVEC DISPOSITIF POUR SA MISE HORS CIRCUIT A LA FIN DE SA DUREE DE VIE UTILE |
Status: | Deemed expired |
(51) International Patent Classification (IPC): |
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(72) Inventors : |
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(73) Owners : |
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(71) Applicants : |
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(74) Agent: | SMART & BIGGAR LLP |
(74) Associate agent: | |
(45) Issued: | 2011-06-14 |
(22) Filed Date: | 2003-04-25 |
(41) Open to Public Inspection: | 2003-10-26 |
Examination requested: | 2008-03-27 |
Availability of licence: | N/A |
(25) Language of filing: | English |
Patent Cooperation Treaty (PCT): | No |
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(30) Application Priority Data: | ||||||
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The invention relates to a low-pressure discharge lamp, having a tubular discharge vessel made from glass, the free ends of which are closed off in a gas tight manner, two electrode systems (3) each having a filament (7), two supply conductors (5, 6) and a bead (8) of glass, the ends of the supply conductors (5, 6) being fused into the ends of the discharge vessel which have been closed off in a gas tight manner and, in order to be held in a region between the filament (7) and the discharge vessel fused seal (2), into the bead (8), and a device for switching off the lamp at the end of its service life, comprising a paste (9) which contains a metal hydride and is fitted to the bead (8). According to the invention, the bead (8) consists of a glass material which has a resistivity of greater 8 .OMEGA.cm at 350°C. Moreover, the paste (9) containing the metal hydride is applied to the bead (8) in the radiation shadow with respect to the thermal radiation which emanates from the filament (7) of the lamp in operation, and is not in electrical contact with the supply conductor wires (5, 6) on the bead (8).
Cette invention se rapporte à une lampe à décharge à basse pression, qui comporte les éléments qui suivent. Un récipient à décharge tubulaire constitué de verre, dont les trois extrémités sont bloquées de manière ferme par du gaz; deux systèmes d'électrodes (3) munis chacun d'un filament (7); deux conducteurs d'alimentation (5, 6); et une perle (8) de verre. Les extrémités des conducteurs d'alimentation (5, 6) sont fondues dans les extrémités du récipient à décharge. Lesdits conducteurs sont emprisonnés de manière ferme par du gaz et, afin d'être maintenus dans une région comprise entre le filament (7) et le joint d'étanchéité fondu du récipient à décharge (2), dans la perle (8); un dispositif de mise hors tension de la lampe à la fin de son cycle de vie, qui comprend une pâte (9) contenant un hybride métallique, et est assemblé à la perle (8). Conformément à l'invention, la perle (8) est constituée de verre dont la résistivité est supérieure à 8 ohms.cm, à 350 degrés C. En outre, la pâte (9) qui contient l'hybride métallique est appliquée à la perle (8) dans la zone d'ombrage de rayonnement par rapport à la thermorayonnance du filament (7) de la lampe en fonctionnement, et n'est pas en contact électrique avec les fils conducteurs d'alimentation (5, 6) sur la perle (8).
Note: Claims are shown in the official language in which they were submitted.
Note: Descriptions are shown in the official language in which they were submitted.
For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee and Payment History should be consulted.
Title | Date |
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Forecasted Issue Date | 2011-06-14 |
(22) Filed | 2003-04-25 |
(41) Open to Public Inspection | 2003-10-26 |
Examination Requested | 2008-03-27 |
(45) Issued | 2011-06-14 |
Deemed Expired | 2015-04-27 |
There is no abandonment history.
Fee Type | Anniversary Year | Due Date | Amount Paid | Paid Date |
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Registration of a document - section 124 | $100.00 | 2003-04-25 | ||
Registration of a document - section 124 | $100.00 | 2003-04-25 | ||
Application Fee | $300.00 | 2003-04-25 | ||
Maintenance Fee - Application - New Act | 2 | 2005-04-25 | $100.00 | 2005-03-31 |
Maintenance Fee - Application - New Act | 3 | 2006-04-25 | $100.00 | 2006-04-03 |
Maintenance Fee - Application - New Act | 4 | 2007-04-25 | $100.00 | 2007-03-14 |
Maintenance Fee - Application - New Act | 5 | 2008-04-25 | $200.00 | 2008-03-12 |
Request for Examination | $800.00 | 2008-03-27 | ||
Maintenance Fee - Application - New Act | 6 | 2009-04-27 | $200.00 | 2009-03-04 |
Maintenance Fee - Application - New Act | 7 | 2010-04-26 | $200.00 | 2010-03-10 |
Maintenance Fee - Application - New Act | 8 | 2011-04-25 | $200.00 | 2011-03-09 |
Final Fee | $300.00 | 2011-03-31 | ||
Maintenance Fee - Patent - New Act | 9 | 2012-04-25 | $200.00 | 2012-03-07 |
Maintenance Fee - Patent - New Act | 10 | 2013-04-25 | $250.00 | 2013-04-15 |
Note: Records showing the ownership history in alphabetical order.
Current Owners on Record |
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PATENT-TREUHAND-GESELLSCHAFT FUER ELEKTRISCHE GLUEHLAMPEN MBH |
Past Owners on Record |
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BLOHM, BERNHARD |
FUCHS, KIRSTEN |
HAMMER, GERALD |
HILSCHER, ACHIM |
HUSSLEIN, PETER |
MACIEJEWSKI, ANDREAS |
NOLL, THOMAS |
PANKRATZ, KLAUS |
WEINGARTNER, KLAUS |